Investigation of the connection between X-ray binaries and compact star clusters in NGC 628

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Avdan Ş., Akyüz A., Acar S., Akkaya Oralhan İ., Allak S., Aksaker N.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol.519, pp.4826-4840, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 519
  • Publication Date: 2023
  • Doi Number: 10.1093/mnras/stac3811
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Compendex, INSPEC, Metadex, zbMATH, DIALNET, Civil Engineering Abstracts
  • Page Numbers: pp.4826-4840
  • Erciyes University Affiliated: Yes


We investigated for a possible connection between the types of X-ray binaries (XRBs) and the properties of compact star clusters in the nearby galaxy NGC 628. Using Chandra archi v al data co v ering the years 2001–2018, 75 X-ray sources were detected within the field of view of observations. A total of 69 XRBs, one of which is an ultraluminous X-ray source (ULX), were found to be in the luminosity range of 3 ×10 36 ≤L X ≤2 ×10 39 erg s −1 . We identified the optical counterpart(s) of 15 of the 42 XRBs that coincide with the HST field of view via impro v ed astrometry. We classified 15 of them as HMXBs based on the presence of the optical counterparts. The remaining sources with no optical counterparts were classified as LMXBs. We also search compact star clusters in this galaxy using the multiband optical images drawn from HST archives. 864 compact star clusters were identified and their ages and masses were determined by applying the best-fit SSP (Simple Stellar Population) model to their colour–colour diagram. We found that in NGC 628, HMXBs are associated with younger star clusters and LMXBs with older ones. Our findings support a connection between different types of XRBs and cluster ages, already known to exist for other galaxies.